Kinetic curves of oil products sorption by calcined sorbent from ash and slag wastes of thermal power engineering

Experimental research into dynamic sorption of model mixtures containing oil products was carried out. As a sorbent, dried and calcined ash and slag wastes accumulated by hydraulic ash removal at the ash disposal site of Novocherkassk State District Power Plant (Novocherkassk, Rostov Oblast, Russia) were investigated. The weighted portion of calcined sorbent for each model solution was fixed and amounted to 5.0 g. Model solutions were passed through a column filled with calcined sorbent. At the first stage, investigations were carried out to optimize the filtrate flow rate in the range from 0.05 to 2.5 dm³/min in increments of 0.05 dm³/min. Model aqueous solutions with pH=7.5 and containing 100 mg/dm³ of oil products were passed through the column containing 5 g of calcined sorbent. The optimum filtrate flow rate was 0.1 dm³/min at a maximum efficiency of oil products extraction from the solution of 84%. At the second stage, kinetic dependencies of sorption capacity and oil product concentration in the filtrate were plotted. To this end, experimental investigations into sorbent saturation with oil products by means of passing portions of model aqueous solution containing 10,000 mg/dm³ by 0.05 dm³ through the column filled with calcined sorbent in a quantity of 5 g and a filtrate withdrawal rate of 0.1 dm³/min were performed. The maximum value of sorption capacity was found to comprise 560 mg/g under the efficiency of oil products extraction from the solution of 85%. Following an analysis of the obtained experimental results, an approach to the mathematical description of the kinetics of oil products sorption was proposed. According to this approach, the concentration of oil products in the filtrate is calculated in two stages. At the first stage, the increase in the concentration of oil products in the filtrate occurs when the sorbent is saturated with oil products up to the maximum value of its sorption capacity. At the second stage, this increase is observed at the maximum value of sorption capacity. Kinetic equations for calculating sorption capacity and the concentration of oil products in the filtrate are provided. A satisfactory qualitative agreement between the experimental and calculated data was obtained.

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